Each plane crash is a tragedy, but speculation as to what happened in France are fruitless until the flight recorders are found and decoded.
Sincere condolences to the families...
They already found it, though not sure how long it takes to decode. Don't flight recorders only collect certain flight data? I guess if it was shot down or just blew up randomly the box wouldn't be able to help (not saying it was anything to do with those two but speaking in general about crashes).
Crew conversations are actually recorded by (at least some) flight recorders, so you should still be able to infer something about circumstances of accidents. As an example, in the
Aerolinee Itavia Flight 870 case pilots chatting about nearby aircrafts movements suddenly stop, due to the airliner being hit by a missile.